The radius of the disk is R, and the mass of the disk is M. Using the parallel axis theorem and theequation for the moment of inertia of a disk about its central axis developed in the previous example, Eq. (8), the moment of inertia of the disk about the specified axis is Fig.
Short Circuits. Short circuits are the second most common reason for breaker tripping and are a more serious concern. Short circuits occur when the black hot wires inside your electrical service panel come in contact with either other hot wires or neutral wires.
More about that later.2. In a circuit, if voltage is constant, current varies inversely with resistance.This second idea states that when resistance goes up, current goes down. That's why corroded connectors cause very dim lights-not enough current. â¢ Watts A watt is an electrical measurement of power or work.